Micro-cold Spray Deposition of YSZ Films from Ultrafine Powders Using a Pressure Relief Channel Nozzle

IF 3.2 3区 材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS Journal of Thermal Spray Technology Pub Date : 2024-08-27 DOI:10.1007/s11666-024-01813-4
Stephen G. Bierschenk, Desiderio Kovar
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Abstract

The use of ultrafine powders in the micro-cold spray (MCS) process, also referred to as the aerosol deposition method, typically results in porous and/or poorly adhering films because the particles do not impact at a high enough velocity for sufficient plastic deformation and interparticle bonding to occur. Under typical operating conditions, particles < 100 nm accelerate to high velocities but then are slowed by the stagnant gas in the bow shock that forms just upstream of the substrate. Using larger particles reduces particle slowing, but large particles can cause erosion of the film at high impact velocity, decreasing deposition efficiency. In this study, a pressure relief channel nozzle using helium as a carrier gas is proposed such that high-velocity deposition of yttria-stabilized zirconia particles as small as 10 nm in diameter is possible. This is well below the size range of powders previously used for MCS. The proposed nozzle design increases impact velocities for 10, 20, and 50 nm particles by ~ 880, 560, and 160 m/s, respectively, when compared to a conventional nozzle. Experimental deposition of ultrafine 8YSZ powder shows that the pressure relief channel nozzle results in lower porosity and more uniform deposits, with a ∼ 186% increase in deposition efficiency.

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使用泄压通道喷嘴从超细粉末微冷喷雾沉积 YSZ 薄膜
在微冷喷雾(MCS)工艺(也称为气溶胶沉积法)中使用超细粉末,通常会产生多孔和/或附着力差的薄膜,因为颗粒的冲击速度不够高,无法产生足够的塑性变形和颗粒间的结合。在典型的操作条件下,100 nm 的颗粒会加速到很高的速度,但随后就会被基底上游形成的弓形冲击中的滞留气体减速。使用较大的颗粒可减少颗粒减速,但大颗粒会在高速冲击时造成薄膜侵蚀,从而降低沉积效率。本研究提出了一种使用氦气作为载气的泄压通道喷嘴,可实现直径小至 10 纳米的钇稳定氧化锆颗粒的高速沉积。这远远低于以前用于 MCS 的粉末尺寸范围。与传统喷嘴相比,建议的喷嘴设计将 10、20 和 50 纳米颗粒的冲击速度分别提高了 ~ 880、560 和 160 米/秒。超细 8YSZ 粉末的沉积实验表明,泄压通道喷嘴可使孔隙率更低,沉积物更均匀,沉积效率提高了 ∼ 186%。
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来源期刊
Journal of Thermal Spray Technology
Journal of Thermal Spray Technology 工程技术-材料科学:膜
CiteScore
5.20
自引率
25.80%
发文量
198
审稿时长
2.6 months
期刊介绍: From the scientific to the practical, stay on top of advances in this fast-growing coating technology with ASM International''s Journal of Thermal Spray Technology. Critically reviewed scientific papers and engineering articles combine the best of new research with the latest applications and problem solving. A service of the ASM Thermal Spray Society (TSS), the Journal of Thermal Spray Technology covers all fundamental and practical aspects of thermal spray science, including processes, feedstock manufacture, and testing and characterization. The journal contains worldwide coverage of the latest research, products, equipment and process developments, and includes technical note case studies from real-time applications and in-depth topical reviews.
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